Calibration method of gravity gradiometer of rotary accelerometer

Abstract

The invention discloses a calibration method of a gravity gradiometer of a rotary accelerometer. After changing of linear motion excitation, angular motion excitation and self-gradient excitation of agravity gradiometer of a rotary accelerometer, a linear motion error coefficient, an angular motion error coefficient, a self-gradient model parameter, and a scale factor of the gravity gradiometer of the rotary accelerometer are calibrated once. The calibrated line motion error coefficient and angular motion error coefficient are used for the online motion error compensation of the gravity gradiometer; and the calibrated self-gradient model parameter is used for self-gradient compensation. According to the provided calibration method, the method is implemented simply without being limited bycalibration occasions and is suitable for the programmatic self-calibration; and thus the method has the great engineering value.

Description

technical field [0001] The invention relates to a calibration method for a gravity gradiometer of a rotational accelerometer, which belongs to the technical field of precision measurement. Background technique [0002] Gravity gradient exploration of moving base is a low-cost and high-efficiency gravity field exploration technology. Gravity gradient data are widely used in geological analysis, gravity field modeling, high-precision navigation, resource exploration, etc. Gravity gradiometers have extremely important civil, national defense, and scientific research values. At present, the mainstream gravity gradiometers under research at home and abroad mainly include cold atom gravity gradiometers, superconducting gravity gradiometers, MEMS gravity gradiometers, and rotational accelerometer gravity gradiometers. Among them, the technology of rotational accelerometer gravity gradiometers is the most mature. Commercial operation has been realized. At present, my country's grav...

AI Technical Summary

Problems solved by technology

[0003] In the gravity gradient exploration of the moving base, due to the installation error of the accelerometer inside the gravity gradiometer, the mismatch of the first-order scale coefficient of the accelerometer, the mismatch of the circuit gain, and the high-order nonlinear error coefficient of the accelerometer, etc. Acceleration, angular velocity, and angular acceleration are transmitted to the output of the gravity gradiometer, causing measurement errors; the output of the acceleration, angular velocity, and angular acceleration excitation of the gravity gradiometer is much greater than the output of the gravitational gradient excitation, which will saturate or damage the gravity gradiometer circuit. Rotational accelerometer gravity gradiometer needs online compensation for motion errors

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